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    <h1>常见问题折叠</h1>
    <div class="container">
        <div class="faq">
          <h3 class="title">
            1+1=?
          </h3>
  
          <p class="text">
            2
          </p>
  
          <button class="btn"><i class="iconfont icon-xiangyou1"></i></button>
        </div>
  
        <div class="faq">
          <h3 class="title">
            1+2=?
          </h3>
          <p class="text">
            3
          </p>
          <button class="btn"><i class="iconfont icon-xiangyou1"></i></button>
        </div>
        
        <div class="faq">
          <h3 class="title">
            1+3=?
          </h3>
          <p class="text">
            4
          </p>
          <button class="btn"><i class="iconfont icon-xiangyou1"></i></button>
        </div>
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